static int __maybe_unused _get_power()

in of.c [1410:1446]

• 30 lines of code
• 5 McCabe index (conditional complexity)

static int __maybe_unused _get_power(unsigned long *mW, unsigned long *kHz,
				     struct device *dev)
{
	struct dev_pm_opp *opp;
	struct device_node *np;
	unsigned long mV, Hz;
	u32 cap;
	u64 tmp;
	int ret;

	np = of_node_get(dev->of_node);
	if (!np)
		return -EINVAL;

	ret = of_property_read_u32(np, "dynamic-power-coefficient", &cap);
	of_node_put(np);
	if (ret)
		return -EINVAL;

	Hz = *kHz * 1000;
	opp = dev_pm_opp_find_freq_ceil(dev, &Hz);
	if (IS_ERR(opp))
		return -EINVAL;

	mV = dev_pm_opp_get_voltage(opp) / 1000;
	dev_pm_opp_put(opp);
	if (!mV)
		return -EINVAL;

	tmp = (u64)cap * mV * mV * (Hz / 1000000);
	do_div(tmp, 1000000000);

	*mW = (unsigned long)tmp;
	*kHz = Hz / 1000;

	return 0;
}